4 #include <linux/rbtree.h>
6 /* bits for the extent state */
8 #define EXTENT_WRITEBACK (1 << 1)
9 #define EXTENT_UPTODATE (1 << 2)
10 #define EXTENT_LOCKED (1 << 3)
11 #define EXTENT_NEW (1 << 4)
12 #define EXTENT_DELALLOC (1 << 5)
13 #define EXTENT_DEFRAG (1 << 6)
14 #define EXTENT_DEFRAG_DONE (1 << 7)
15 #define EXTENT_BUFFER_FILLED (1 << 8)
16 #define EXTENT_BOUNDARY (1 << 9)
17 #define EXTENT_NODATASUM (1 << 10)
18 #define EXTENT_DO_ACCOUNTING (1 << 11)
19 #define EXTENT_FIRST_DELALLOC (1 << 12)
20 #define EXTENT_NEED_WAIT (1 << 13)
21 #define EXTENT_DAMAGED (1 << 14)
22 #define EXTENT_NORESERVE (1 << 15)
23 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
24 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
27 * flags for bio submission. The high bits indicate the compression
30 #define EXTENT_BIO_COMPRESSED 1
31 #define EXTENT_BIO_TREE_LOG 2
32 #define EXTENT_BIO_PARENT_LOCKED 4
33 #define EXTENT_BIO_FLAG_SHIFT 16
35 /* these are bit numbers for test/set bit */
36 #define EXTENT_BUFFER_UPTODATE 0
37 #define EXTENT_BUFFER_BLOCKING 1
38 #define EXTENT_BUFFER_DIRTY 2
39 #define EXTENT_BUFFER_CORRUPT 3
40 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
41 #define EXTENT_BUFFER_TREE_REF 5
42 #define EXTENT_BUFFER_STALE 6
43 #define EXTENT_BUFFER_WRITEBACK 7
44 #define EXTENT_BUFFER_IOERR 8
45 #define EXTENT_BUFFER_DUMMY 9
46 #define EXTENT_BUFFER_IN_TREE 10
48 /* these are flags for extent_clear_unlock_delalloc */
49 #define PAGE_UNLOCK (1 << 0)
50 #define PAGE_CLEAR_DIRTY (1 << 1)
51 #define PAGE_SET_WRITEBACK (1 << 2)
52 #define PAGE_END_WRITEBACK (1 << 3)
53 #define PAGE_SET_PRIVATE2 (1 << 4)
56 * page->private values. Every page that is controlled by the extent
57 * map has page->private set to one.
59 #define EXTENT_PAGE_PRIVATE 1
60 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
66 typedef int (extent_submit_bio_hook_t
)(struct inode
*inode
, int rw
,
67 struct bio
*bio
, int mirror_num
,
68 unsigned long bio_flags
, u64 bio_offset
);
69 struct extent_io_ops
{
70 int (*fill_delalloc
)(struct inode
*inode
, struct page
*locked_page
,
71 u64 start
, u64 end
, int *page_started
,
72 unsigned long *nr_written
);
73 int (*writepage_start_hook
)(struct page
*page
, u64 start
, u64 end
);
74 int (*writepage_io_hook
)(struct page
*page
, u64 start
, u64 end
);
75 extent_submit_bio_hook_t
*submit_bio_hook
;
76 int (*merge_bio_hook
)(int rw
, struct page
*page
, unsigned long offset
,
77 size_t size
, struct bio
*bio
,
78 unsigned long bio_flags
);
79 int (*readpage_io_failed_hook
)(struct page
*page
, int failed_mirror
);
80 int (*readpage_end_io_hook
)(struct btrfs_io_bio
*io_bio
, u64 phy_offset
,
81 struct page
*page
, u64 start
, u64 end
,
83 int (*writepage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
84 struct extent_state
*state
, int uptodate
);
85 void (*set_bit_hook
)(struct inode
*inode
, struct extent_state
*state
,
87 void (*clear_bit_hook
)(struct inode
*inode
, struct extent_state
*state
,
89 void (*merge_extent_hook
)(struct inode
*inode
,
90 struct extent_state
*new,
91 struct extent_state
*other
);
92 void (*split_extent_hook
)(struct inode
*inode
,
93 struct extent_state
*orig
, u64 split
);
96 struct extent_io_tree
{
98 struct address_space
*mapping
;
102 struct extent_io_ops
*ops
;
105 struct extent_state
{
107 u64 end
; /* inclusive */
108 struct rb_node rb_node
;
110 /* ADD NEW ELEMENTS AFTER THIS */
111 struct extent_io_tree
*tree
;
112 wait_queue_head_t wq
;
116 /* for use by the FS */
119 #ifdef CONFIG_BTRFS_DEBUG
120 struct list_head leak_list
;
124 #define INLINE_EXTENT_BUFFER_PAGES 16
125 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
126 struct extent_buffer
{
129 unsigned long map_start
;
130 unsigned long map_len
;
131 unsigned long bflags
;
132 struct btrfs_fs_info
*fs_info
;
133 spinlock_t refs_lock
;
137 struct rcu_head rcu_head
;
140 /* count of read lock holders on the extent buffer */
141 atomic_t write_locks
;
143 atomic_t blocking_writers
;
144 atomic_t blocking_readers
;
145 atomic_t spinning_readers
;
146 atomic_t spinning_writers
;
149 /* protects write locks */
152 /* readers use lock_wq while they wait for the write
153 * lock holders to unlock
155 wait_queue_head_t write_lock_wq
;
157 /* writers use read_lock_wq while they wait for readers
160 wait_queue_head_t read_lock_wq
;
161 struct page
*pages
[INLINE_EXTENT_BUFFER_PAGES
];
162 #ifdef CONFIG_BTRFS_DEBUG
163 struct list_head leak_list
;
167 static inline void extent_set_compress_type(unsigned long *bio_flags
,
170 *bio_flags
|= compress_type
<< EXTENT_BIO_FLAG_SHIFT
;
173 static inline int extent_compress_type(unsigned long bio_flags
)
175 return bio_flags
>> EXTENT_BIO_FLAG_SHIFT
;
178 struct extent_map_tree
;
180 typedef struct extent_map
*(get_extent_t
)(struct inode
*inode
,
186 void extent_io_tree_init(struct extent_io_tree
*tree
,
187 struct address_space
*mapping
);
188 int try_release_extent_mapping(struct extent_map_tree
*map
,
189 struct extent_io_tree
*tree
, struct page
*page
,
191 int try_release_extent_buffer(struct page
*page
);
192 int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
193 int lock_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
194 unsigned long bits
, struct extent_state
**cached
);
195 int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
196 int unlock_extent_cached(struct extent_io_tree
*tree
, u64 start
, u64 end
,
197 struct extent_state
**cached
, gfp_t mask
);
198 int try_lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
199 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
200 get_extent_t
*get_extent
, int mirror_num
);
201 int extent_read_full_page_nolock(struct extent_io_tree
*tree
, struct page
*page
,
202 get_extent_t
*get_extent
, int mirror_num
);
203 int __init
extent_io_init(void);
204 void extent_io_exit(void);
206 u64
count_range_bits(struct extent_io_tree
*tree
,
207 u64
*start
, u64 search_end
,
208 u64 max_bytes
, unsigned long bits
, int contig
);
210 void free_extent_state(struct extent_state
*state
);
211 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
212 unsigned long bits
, int filled
,
213 struct extent_state
*cached_state
);
214 int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
215 unsigned long bits
, gfp_t mask
);
216 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
217 unsigned long bits
, int wake
, int delete,
218 struct extent_state
**cached
, gfp_t mask
);
219 int set_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
220 unsigned long bits
, gfp_t mask
);
221 int set_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
222 unsigned long bits
, u64
*failed_start
,
223 struct extent_state
**cached_state
, gfp_t mask
);
224 int set_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
225 struct extent_state
**cached_state
, gfp_t mask
);
226 int clear_extent_uptodate(struct extent_io_tree
*tree
, u64 start
, u64 end
,
227 struct extent_state
**cached_state
, gfp_t mask
);
228 int set_extent_new(struct extent_io_tree
*tree
, u64 start
, u64 end
,
230 int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
232 int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
, u64 end
,
234 int convert_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
235 unsigned long bits
, unsigned long clear_bits
,
236 struct extent_state
**cached_state
, gfp_t mask
);
237 int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
, u64 end
,
238 struct extent_state
**cached_state
, gfp_t mask
);
239 int set_extent_defrag(struct extent_io_tree
*tree
, u64 start
, u64 end
,
240 struct extent_state
**cached_state
, gfp_t mask
);
241 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
242 u64
*start_ret
, u64
*end_ret
, unsigned long bits
,
243 struct extent_state
**cached_state
);
244 int extent_invalidatepage(struct extent_io_tree
*tree
,
245 struct page
*page
, unsigned long offset
);
246 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
247 get_extent_t
*get_extent
,
248 struct writeback_control
*wbc
);
249 int extent_write_locked_range(struct extent_io_tree
*tree
, struct inode
*inode
,
250 u64 start
, u64 end
, get_extent_t
*get_extent
,
252 int extent_writepages(struct extent_io_tree
*tree
,
253 struct address_space
*mapping
,
254 get_extent_t
*get_extent
,
255 struct writeback_control
*wbc
);
256 int btree_write_cache_pages(struct address_space
*mapping
,
257 struct writeback_control
*wbc
);
258 int extent_readpages(struct extent_io_tree
*tree
,
259 struct address_space
*mapping
,
260 struct list_head
*pages
, unsigned nr_pages
,
261 get_extent_t get_extent
);
262 int extent_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
263 __u64 start
, __u64 len
, get_extent_t
*get_extent
);
264 int get_state_private(struct extent_io_tree
*tree
, u64 start
, u64
*private);
265 void set_page_extent_mapped(struct page
*page
);
267 struct extent_buffer
*alloc_extent_buffer(struct btrfs_fs_info
*fs_info
,
268 u64 start
, unsigned long len
);
269 struct extent_buffer
*alloc_dummy_extent_buffer(u64 start
, unsigned long len
);
270 struct extent_buffer
*btrfs_clone_extent_buffer(struct extent_buffer
*src
);
271 struct extent_buffer
*find_extent_buffer(struct btrfs_fs_info
*fs_info
,
273 void free_extent_buffer(struct extent_buffer
*eb
);
274 void free_extent_buffer_stale(struct extent_buffer
*eb
);
276 #define WAIT_COMPLETE 1
277 #define WAIT_PAGE_LOCK 2
278 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
279 struct extent_buffer
*eb
, u64 start
, int wait
,
280 get_extent_t
*get_extent
, int mirror_num
);
281 void wait_on_extent_buffer_writeback(struct extent_buffer
*eb
);
283 static inline unsigned long num_extent_pages(u64 start
, u64 len
)
285 return ((start
+ len
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
) -
286 (start
>> PAGE_CACHE_SHIFT
);
289 static inline struct page
*extent_buffer_page(struct extent_buffer
*eb
,
295 static inline void extent_buffer_get(struct extent_buffer
*eb
)
297 atomic_inc(&eb
->refs
);
300 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
303 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
306 int read_extent_buffer_to_user(struct extent_buffer
*eb
, void __user
*dst
,
309 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
310 unsigned long start
, unsigned long len
);
311 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
312 unsigned long dst_offset
, unsigned long src_offset
,
314 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
315 unsigned long src_offset
, unsigned long len
);
316 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
317 unsigned long src_offset
, unsigned long len
);
318 void memset_extent_buffer(struct extent_buffer
*eb
, char c
,
319 unsigned long start
, unsigned long len
);
320 void clear_extent_buffer_dirty(struct extent_buffer
*eb
);
321 int set_extent_buffer_dirty(struct extent_buffer
*eb
);
322 int set_extent_buffer_uptodate(struct extent_buffer
*eb
);
323 int clear_extent_buffer_uptodate(struct extent_buffer
*eb
);
324 int extent_buffer_uptodate(struct extent_buffer
*eb
);
325 int extent_buffer_under_io(struct extent_buffer
*eb
);
326 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
327 unsigned long min_len
, char **map
,
328 unsigned long *map_start
,
329 unsigned long *map_len
);
330 int extent_range_clear_dirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
331 int extent_range_redirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
332 int extent_clear_unlock_delalloc(struct inode
*inode
, u64 start
, u64 end
,
333 struct page
*locked_page
,
334 unsigned long bits_to_clear
,
335 unsigned long page_ops
);
337 btrfs_bio_alloc(struct block_device
*bdev
, u64 first_sector
, int nr_vecs
,
339 struct bio
*btrfs_io_bio_alloc(gfp_t gfp_mask
, unsigned int nr_iovecs
);
340 struct bio
*btrfs_bio_clone(struct bio
*bio
, gfp_t gfp_mask
);
342 struct btrfs_fs_info
;
344 int repair_io_failure(struct btrfs_fs_info
*fs_info
, u64 start
,
345 u64 length
, u64 logical
, struct page
*page
,
347 int end_extent_writepage(struct page
*page
, int err
, u64 start
, u64 end
);
348 int repair_eb_io_failure(struct btrfs_root
*root
, struct extent_buffer
*eb
,
350 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
351 noinline u64
find_lock_delalloc_range(struct inode
*inode
,
352 struct extent_io_tree
*tree
,
353 struct page
*locked_page
, u64
*start
,
354 u64
*end
, u64 max_bytes
);
355 struct extent_buffer
*alloc_test_extent_buffer(struct btrfs_fs_info
*fs_info
,
356 u64 start
, unsigned long len
);